The 2 piece canning lids (flats and rings) are designed to create the proper vacuum when canning. I don’t know of any way to use the leftover commercial one piece screw on metal lids in Home canning to get the correct vacuum seal. I would not risk it. Use those jars for jelly with parrafin wax or just general storage of dried herbs, etc. if you want to Home can fruits, vegetables or meats, you need to invest in the proper Ball type jars, lids and Home pressure canner to do it safely. This is not the area to be penny wise and pound foolish in my opinion.